381328508 has 24 divisors (see below), whose sum is σ = 732640944. Its totient is φ = 172224000.

The previous prime is 381328501. The next prime is 381328553. The reversal of 381328508 is 805823183.

It is a super-2 number, since 2×381328508² = 290822862027012128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381328501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20693 + ... + 34508.

It is an arithmetic number, because the mean of its divisors is an integer number (30526706).

Almost surely, 2^381328508 is an apocalyptic number.

It is an amenable number.

381328508 is a deficient number, since it is larger than the sum of its proper divisors (351312436).

381328508 is a wasteful number, since it uses less digits than its factorization.

381328508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55373 (or 55371 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 381328508 is about 19527.6344701554. The cubic root of 381328508 is about 725.1587495413.

The spelling of 381328508 in words is "three hundred eighty-one million, three hundred twenty-eight thousand, five hundred eight".